Albert brotjghton



maire srrrns rnr ermee.

ALBERT BROUGHTON, OF MALONE, NE7 YORK, ASSIGNOR TO HIMSELF, ALEX. LINDSEY, AND JOHN R. PLATT, OF SAME PLACE.

MACHINE FOR GRINDING- AND POLISI-IING GLASS, &C.

Specification of Letters Patent No. 28,532, dated May 29, 1860.

To all whom it may concern:

Be it known that I, ALBERT BnoUGHToN,

of Malone, in the county of Franklin and State of New York, have invented a new and useful Improvement in Machinery for Grinding and Polishing Glass, Stone, Metal, and other Substances; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings,form ing part of this specification, in which- Figure l is a plan of a machine constructed according to my invention, having the bed on which the substance to be grooved or polished, omitted. Fig. 2 is a transverse vertical section of the machine.

Similar letters of reference indicate corresponding parts in both figures.

To enable othersskilled in the art to make and use my invention I will proceed to describe its construction and operation.

A is an oblong quadrangular frame; on the top of which are parallel horizontal ways a, a, to receive the carriage B, on which is placed t-he horizontal bed O, (Fig. 2) on which the material D, to be ground or polished is placed. The bed O, and the material are omitted in Fig. l, to expose the frame and the mechanism below by which its rectilinearly reciprocating motion on the ways a, a, is produced, such mechanism being that which constitutes the subject of my Letters Patent dated Sept. 13th, 1859, consisting of two parallel toothed racks b, I), secured to the frame, and an upright shaft E, which is arranged within the frame, and carries two pinions c, c, and which has a rotary motion and a slight lateral motion to bring it into gear with each rack alternately. I do not, however, confine myself to the use of this mechanism to produce the reciprocating motion of the frame, but propose to use any known or suitable mechanism for this purpose.

F is a stationary upright frame secured to and extending across the top of the frame A, over the carriage B, and bed O, and containing upright ways c, c, to which is fitted an upright adjustable frame H, which contains the bearings for an upright shaft I, to the lower end of which is rigidly secured a circular plate or disk J, to which are secured the three upright studs or axles (Z, cl, CZ, to which the polishing disks K,K,K,of which there may be any number, are fitted in such manner as to be capable of rotating freely.

F, is a stationary upright frame secured to and extending across the top of the frame A, over the carriage B, and bed C, and containing upright ways e, e, to which is fitted an upright adjustable frame H, which contains the bearings for an upright shaft I, to the lowerend of which is rigidly secured a circular plate or disk J, to which are secured the three upright studs or aXles (Z, CZ, d, to

which the polishing disks K, K, K, of which there may be any number, are fitted in such manner as to be capable of rotating freely. These studs CZ, (l, (l, may be made adjustable nearer to or farther from the center of the shaft I, by fitting them to radial slots in the disk J. Instead of fitting the disks K, K, K, to studs secured ixedly in the disk J, they may be keyed to short upright axles tted to rotate in bearings in the disk J. The disks K, K, K, may be of metal or other material and may be composed of, or faced with any substance suitable for grinding or polishing or for holding sand or other grinding or polishing material.

L, is a screw connected wit-h the adjustable frame H, and fitted to the stationary frame F, in such manner as to be capable of raising and lowering the latter and with it the shaft I, and disks in such manner as to adjust the latter at various heights according Vto the thickness of the substance to be ground or polished and to make the disks K, K, K, bear upon such substance with any degree of pressure that may be desirable.

M is the main shaft of the machine arranged vertically in suit-able bearings in side frames N, N, secured to the frame A, and carrying a pulley O, from which a belt R, runs to a pulley P, on the shaft I, and a chain wheel Q; from which a chain S, runs to a chain wheel T, on the shaft E, said belt and chain driving the said shafts I, and E. This shaft M, may be driven by any suitable means.

The operation of the machine is as follows: The piece of material D, to be ground or polished having been placed upon the bed O, the shaft M, is set in motion, and by the rotary motion it imparts to the shafts E, and I, the bed and the substance upon it are caused to have a horizontal reciprocating motion 'on the Ways a', a', and the disk J, is caused to rotate and carry with it the disks K. The frame H, H, is then adjusted to bring the faces of the disks K, K, into contact With, or sufliciently near to the upper surface of the piece D; and the sand or other grinding or polishing material, whenA any is necessary, having been applied either with or Without Water, the grinding or polishing operation commences, and the disks K, K, K, vare caused to rotate each upon its own axis, by the friction between their faces and the piece D, and hence thesaid disks have a complete planetary or compound rotary motion, by which, as the piece D, moves back and forth beneath them, every part of its surface is ground or polished to a plane surface. lVhen one side of the piece is finished and the other side is required to be ground or polished it is turned over and'a similar operation proceeded with on that side, Which is also brought to a perfectly plane surface, and as each surface is made parallel With the plane of motion of the bed and the plane of revolution of the disk J both of Which are positive and parallel With each other, the

tWo surfaces produced are perfectly parallel and the substance is of perfectly uniform thickness throughout. By the combination of the positive rectilinear motion of the bed the positive rotary motion of the axes of the disks M, M, and the rotary motion of the said disks on their axes produced by friction a peculiar compound relative movement is obtained between the operating surfaces and the surfaces operated upon Which is found in polishing to produce a very superior effect. Y

I do not claim applying and operating a series of grinding or polishing disks in such manner as to have a planetary motion, as such a series of disks is described in the Letters Patent of Alexander Lindsey, dated ALBERT BROUGHTON.,

Witnesses:

MICH. HUGHES, CHARLES M. HUGHES. 

